// (c) Copyright Ascensio System SIA 2009-2024
//
// This program is a free software product.
// You can redistribute it and/or modify it under the terms
// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
// Foundation. In accordance with Section 7(a) of the GNU AGPL its Section 15 shall be amended
// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
// any third-party rights.
//
// This program is distributed WITHOUT ANY WARRANTY, without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For details, see
// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
//
// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
//
// The  interactive user interfaces in modified source and object code versions of the Program must
// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
//
// Pursuant to Section 7(b) of the License you must retain the original Product logo when
// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
// trademark law for use of our trademarks.
//
// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode

import { useEffect, useCallback } from "react";

import { zendeskAPI } from "./Zendesk.utils";

interface Props {
  zendeskKey: string;
  defer?: boolean;
  onLoaded?: () => void;
  config?: {};
  isShowLiveChat: boolean;
}

const Zendesk = ({
  zendeskKey,
  defer,
  onLoaded,
  config,
  isShowLiveChat,
}: Props) => {
  const onScriptLoaded = useCallback(() => {
    const waitingChanges = zendeskAPI.getChanges();
    if (waitingChanges.length > 0) {
      waitingChanges.forEach((v) => zendeskAPI.addChanges(...v));
      zendeskAPI.clearChanges();
    }

    if (typeof onLoaded === "function") {
      onLoaded();
    }
  }, [onLoaded]);

  const insertScript = useCallback(
    (zdKey: string, d?: boolean) => {
      const ZENDESK_ID = "ze-snippet";

      const includeScript = Boolean(document?.getElementById(ZENDESK_ID));

      if (includeScript) return;

      const script = document.createElement("script");
      if (d) {
        script.defer = true;
      } else {
        script.async = true;
      }
      script.id = ZENDESK_ID;
      script.src = `https://static.zdassets.com/ekr/snippet.js?key=${zdKey}`;
      script.addEventListener("load", onScriptLoaded);
      document.body.appendChild(script);
    },
    [onScriptLoaded],
  );

  useEffect(() => {
    if (
      typeof window?.document?.createElement !== "undefined" &&
      !window?.zE &&
      isShowLiveChat
    ) {
      insertScript(zendeskKey, defer);

      window.zESettings = { ...(config || {}) };
    }
  }, [zendeskKey, defer, insertScript, config, isShowLiveChat]);

  return null;
};

export { Zendesk };
